Thank you for posting to the Telerik Developer Forums.
1. Regarding the "XMLHttpRequest cannot load...
" error. If you are using the AppBuilder Web client, this is a CORS-related problem. You can workaround the issue by running the app on a device or by using the AppBuilder Desktop client or the VS Extension.
2. Could you please be more specific which functionality is not working as expected? Is the expected functionality available only in SignalR v. 2.1.1? Could you elaborate on your implementation and the expected behavior?
Please, explore this blog post
along with the sample code in the GitHub repository, it uses a higher version of SignalR.
In addition, the documentation about the data source configuration
for working with a SignalR hub could be helpful. Also note the push
event of the data source which is called when a notification from the hub is received and the transport.push
configuration used to supply the callbacks for the notification events.
I look forward to your reply.